Actuators receive signals from the powertrain control module and carry out adjustments needed based on the data the PCM received from the sensors.

The engine (or cylinder) block is the large casing that contains the cylinders and many of the internal components of the engine.

The fluid reservoir stores the brake fluid that the master cylinder uses to maintain hydraulic pressure.

Combustion is the burning of an air-fuel mixture to provide energy. It requires the presence of air, fuel, and a heat source to ignite the air-fuel mixture. In the internal combustion engine that powers automobiles and trucks the combustion happens inside the engine utilzing a fuel like gasoline, diesel fuel, or natural gas.

The master (brake) cylinder converts pressure on the brake pedal to hydraulic pressure in the brake lines.